Knife block



FIG. 1 is a front perspective view of a knife block, showing our new design;

FIG. 2 is a right view thereof;

FIG. 3 is a left view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a back view thereof.

The broken line portions show unclaimed subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a knife block, as shown and described. 